Ans: Authentication methods can vary. It's common to use API keys or OAuth tokens. For encrypted version header_secrets and pass_key will be used for authentication. For non-encrypted version client_id and client_secret will be used for authentication.

Ans: Rate limits define the number of API requests allowed within a specific timeframe. We don't have any rate limits for the APIs.

Ans: Errors can result from various issues such as invalid input, authentication failures, or server problems. Ensure your requests are correctly formatted and authenticated. For persistent issues, consider reaching out to iServeU's support team.

Ans: The update frequency can impact the accuracy of the information retrieved.

Ans: Yes, there is sandbox environment available.

Ans: Yes, the Electricity Bill Fetch API provides access to only the latest month's data, and that too only if the bill is pending. If the bill has already been paid, the API response will not return any values.